Documentary guru Morgan Spurlock got a Ph.D. in weed working at a medical marijuana dispensary for an episode of his series “Inside Man.” “I was surprised how many edibles of marijuana there were,” he told us at the Hudson Hotel. “Cookies and brownies and cakes and pies and gum and lozenges and gummy bears and goldfish and those little Listerine strips, gumballs, jawbreakers, sticks you can swizzle your tea . . . This is a whole ’nother world.” Did he try any? “I was staying lean and mean on this one,” he said, adding his favorite name for a particular strain was “Urkel Train.”